Cylinder Block Assembly: Specifications
Cylinder BlockBore
997 S 102.0 mm
Crankshaft Main Bearings
Plain bearings, dia. 63 mm (2.48 in)
Marking for bearing shell allocation on the crankshaft
G - Bearing shell, Yellow
R - Bearing shell, Red
B - Bearing shell, Blue
Crankcase 1-3: Markings on crankcase half. The series of letters -1- is read from left to right. Allocation starts at the flywheel side and ends at the supporting mount on the belt side.
G - Bearing shell, Yellow
R - Bearing shell, Red
B - Bearing shell, Blue
Marking on crankcase half 1-3
Crankcase Through-Bolt Screws
Please refer to Assembling Engine for screw locations and tightening sequence. Assembling the Engine
Connecting rod bolts M10 x 1.25 x 51
Always replace
Initial tightening 20 Nm (15 ftlb.)
Torque angle 80°
Piston and ring specifications
Check the piston diameter -D- at the prescribed measuring point on the piston shank using an outside micrometer.
Measuring point from lower edge of shank dimension X = 15 mm.
Checking the piston shank diameter
The maximum wear allowed at the specified measuring point is 100 microns (= 0.1 mm). If this measurement is exceeded, the piston must be replaced. The reference measurements are listed in the table below.
Piston rings and piston ring groove:
Piston rings:
- Check piston rings for signs of wear.
- Piston-ring end clearance is measured in the cylinder.
Piston pin:
- Check for signs of wear and tear.
- Dimensional check using outside micrometer: diameter = 22.0 - 0.02 mm.
Vibration damper to crankshaft M8 x 1 x 25 outer Torx(R) 60 Nm (44 ftlb.)
Tighten screws uniformly to the tightening specification in diagonally opposite sequence.